Faithless, chaotic, and corrupt: Donald Trump's character also shapes his foreign policy. The latest victim is Saudi Arabia—not a sympathetic victim, maybe, but a victim all the same.On July 22, United States Energy Secretary Chris Wright and his Saudi counterpart signed an agreement for a Saudi-U.S. civilian nuclear partnership. The multi-decade, multibillion-dollar deal allows American companies to develop and operate commercial nuclear power plants on Saudi soil, potentially including a uranium-enrichment facility. The Saudis have sought such a deal for almost 20 years. United States presidents from Barack Obama onward have expressed openness to it, but on two conditions: Any...